If you end up starting at a settlement around C, this list will help you find nearby settlements, helping you to choose missions that won't have a excessive travel time.
In alphabetical order:
- Alanzuela Manufacturing: C 3
- Araujo Cultivation Estate: C 3
- Armstrong's Legacy: C 5
- Belamy Industrial Silo: C 3
- Betancourt's Folly: C 1
- Boldyr Military Bastion: C 10 D
- Brandt Analytics Institution: C 12 F 1
- Collins Analytics Facility: C 10 C
- Cukkemane Hydroponics: C 5
- Dayal Agricultural Nursery: C 6 A
- Deol's Depot: C 4
- Dias Oasis: C 6 A
- Eames Horticultural: C 4
- Fearn Settlement: C 2
- Folorunsho Biological Lab: C 12 F
- Fukusa Cultivation Hub: C 3
- Jae Agricultural Market: C 5
- Jia Agricultural Hub: C 4
- Jia Genetics Institution: C 10 A
- Karpenko Biological: C 12 B
- Krisjanis Military: C 12 C
- Lim Genetics Installation: C 10 D
- Lopex de Villalobos Beacon: C 5
- Lugun's Fort: C 10 A
- Mathibeli Analytics Lab: C 10 B
- Nachtigal's Folly: C 4
- Ovcharenko Analytics: C 12 A
- Pedder Manufacturing: C 5
- Pak Arms Facility: C 12 A
- Pereira's Habitat: C 5
- Puleston Depot: C 4
- Sagar Agricultural Holdings: C 4
- Sahaidachny Plantations: C 3
- Schulte Biological: C 6 A
- Sugiyama's Biochemicals: C 12 C
- Tanaka Hydroponics Market: C 3
- Thakur Arms Stockade: C 6 A
- Thompson Horticultural: C 5
- Turay Camp: C 12 A
Please post any corrections or additions and I'll add to the list
Source: https://www.reddit.com/r/EliteDangerous/comments/mg2r8g/odyssey_all_settlements_at_adityan_c/